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What's new: -----------

What changed: -------------

- Windows 10 1803 or later and WSL installed:

  Starting with 3.0.0, mkdir(2) automatically created directories
within
  the Cygwin installation dir  as  case  sensitive.   This  badly
breaks
  interoperability  with  remote  machines trying to access these
dirs.
  Therefore, disable this as default.  You can still create case-
sensitive
  dirs via `chattr +C ...'

Bug Fixes ---------

- Fix timerfd select always returning immediately.
  Addresses: https://cygwin.com/ml/cygwin/2019-02/msg00364.html

-  Fix  fork/exec  failing  to restore timerfd share mem in child
process.
  Addresses: https://cygwin.com/ml/cygwin/2019-02/msg00400.html

- Drop enforcing case-correct group  names  for  AD  accounts  to
avoid
  excessively long startup times.
  Addresses: https://cygwin.com/ml/cygwin/2019-02/msg00301.html

- Fix and speed up evaluation of group membership in seteuid.
  Addresses: Local testing.

- Fix getitimer/timer_gettime values returned for unarmed timer.
  Addresses: https://cygwin.com/ml/cygwin/2019-02/msg00395.html

- Fix a fork issue with mmap on Windows 8 / Server 2012.
  Addresses: https://cygwin.com/ml/cygwin/2019-03/msg00012.html